Off-Balance Sheet Lending-Related Financial Instruments, Guarantees and Other Commitments - Standby and Other Letters of Credit and Other Financial Guarantees (Details 1) (USD $)	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	$ 997,503,000,000	$ 975,662,000,000	$ 985,934,000,000
Allowance for lending-related commitments	750,000,000	673,000,000	688,000,000	717,000,000
Standby Letters of Credit, Unissued Commitments	43,500,000,000	44,100,000,000
Derivatives Qualifying As Guarantees [Member]
Derivatives qualifying as guarantees
Derivative, Notional Amount	26,100,000,000	26,100,000,000
Derivative Qualifying As Guarantees Receivables	91,000,000	98,000,000
Derivative Qualifying As Guarantees Payables	315,000,000	555,000,000
Guarantee Obligations Maximum Exposure Derivatives	72,800,000,000	75,600,000,000
Derivatives Maximum Exposure To Loss	2,800,000,000	2,800,000,000
Standby and Other Letters of Credit [Member]
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]
Standby and Other Letters of Credit, Carrying Value	695,000,000	698,000,000
Standby and Other Letters of Credit: Allowance	317,000,000	319,000,000
Guarantor Obligations, Current Carrying Value	378,000,000	379,000,000
Wholesale
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	401,064,000,000	382,739,000,000
Standby Letters of Credit, and Other Financial Guarantees [Member]
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]
Standby Letters of Credit and Other Financial Guarantees, Internal Credit Rating, Investment Grade	79,149,000,000	78,884,000,000
Standby Letters of Credit and Other Financial Guarantees, Internal Credit Rating, Non Investment Grade	22,865,000,000	23,015,000,000
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	102,014,000,000	101,899,000,000
Allowance for lending-related commitments	315,000,000	317,000,000
Standby Letters of Credit, Collateral Held	42,263,000,000	41,529,000,000
Off balance sheet Lending related commitments Wholesale Contractual amount Net of Risk Participations Standby letters of credit and other financial guarantees	18,700,000,000	19,800,000,000
Other letters of credit
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]
Standby Letters of Credit and Other Financial Guarantees, Internal Credit Rating, Investment Grade	3,558,000,000	4,105,000,000
Standby Letters of Credit and Other Financial Guarantees, Internal Credit Rating, Non Investment Grade	1,549,000,000	1,281,000,000
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	5,107,000,000	5,386,000,000
Allowance for lending-related commitments	2,000,000	2,000,000
Other Letters of Credit, Collateral Held	1,201,000,000	1,264,000,000
Off balance sheet Lending related commitments Wholesale Contractual amount Net of Risk Participations Other letters of credit	$ 934,000,000	$ 974,000,000